Apparatus for signalling within a borehole while drilling

Details Apparatus for signalling within a borehole while drilling Apparatus for signalling within a borehole while drilling

1984-11-14

1987-06-23

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

367 83, 181106, 33307, G01V 140, E21B 4712

Patent

active

046758526

ABSTRACT:
A down-hole signal generator for a mud-pulse telemetry system comprises an annular impeller surrounding a casing and arranged to be driven by the mud passing along the drill string. The impeller serves to drive a torque control arrangement, and preferably also an electrical generator, within the casing. The torque control arrangement is switchable between two states by a signalling actuator in response to an electrical input signal. In a first state the impeller may be driven relatively easily so that it is rotated at a relatively fast speed by the mud flow, whereas, in a second state, a greater torque is required to drive the impeller so that it is rotated at a relatively slow speed. Thus suitable variation of the input signal may be used to vary the impeller speed to transmit a modulated pressure signal in the mud flow which may be sensed at the surface.

REFERENCES:
patent: Re29734 (1978-08-01), Manning
patent: Re30055 (1979-07-01), Claycamb
patent: Re30246 (1980-04-01), Richter et al.
patent: 3792429 (1974-02-01), Patton et al.
patent: 3982224 (1976-09-01), Patton
patent: 3997867 (1976-12-01), Claycomb
patent: 4167000 (1979-09-01), Bernard et al.
Patton et al., Development and Successful Testing of a Continuous-Wave . . . ", 10/77, Jour. Petr. Tech., pp. 1215-1221.

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